Voltus raises $225 million to scale BYOC for data centers

A little over a year after launching the first “bring your own distributed capacity” program for data centers in the Mid-Atlantic, virtual power plant provider Voltus announced today it has raised $225 million to scale that offering even further.

The oversubscribed Series D is Voltus’ first raise since 2021, when it raised a $31 million Series C. At the time, Voltus was a relative newcomer to the market, with 1.7 gigawatts of load under management. In the years since, though, the VPP market has evolved from being dominated by pilot projects to gigawatt-scale portfolios; according to CEO Dana Guernsey, they’re now a “foundational backbone solution of the grid.”

Voltus formally launched its BYOC product in PJM last September, introducing a go-to-market framework in which data centers can finance and then harness the flexibility potential of the communities around them, bringing those megawatts to utilities as part of their capacity stack. But the company had been working on the product for two years prior to that announcement, Guernsey explained. Voltus announced its first official BYOC customer, Google, in June.

Voltus didn’t enter 2026 expecting to raise money, she added The company wanted to double down on batteries, and get a few hyperscaler capacity deals under its belt. But by the spring, it became “pretty apparent to us as we were signing these BYOC contracts that now was the time to accelerate,” she explained.

The raise itself, internally dubbed “Project Accelerate,” came together quickly, and investor appetite was immense: “Over the course of the last year and even just months, more and more folks have understood…that this is how we bring more capacity online,” Guernsey said, adding that the announcement of the partnership with Google was a key proof point. “We have proven this thesis. This is an execution play.”

Ultimately, Guernsey said, Voltus had “the embarrassment of riches, in that we were able to really pick and choose [investors] that were going to bring more than just capital.” The round was co-led by Generation Investment Management, the investment firm founded by former U.S. Vice President Al Gore, Activate Capital, which led Voltus’ Series C, and Dutch multinational energy trading company Vitol.

In June, Axios described the Series D round as the company’s “final private raise before it goes public.” Guernsey declined to comment directly on IPO plans, but said going public via an initial public offering is one of many options Voltus is considering.

Meteoric growth

Summer 2025, when Voltus began dispatching assets every day of the year, was a turning point for the company — and the wider industry. Between a surge of emergency dispatches in the Mid-Atlantic and daily calls for short bursts of grid-balancing support in the Southwest Power Pool, Voltus’ resources rapidly became a core part of the grid’s everyday operations, Guernsey explained at the time.

The year since has been a flurry of announcements and partnerships for Voltus. In addition to acquiring energy storage startup Brightfield and announcing Google as the first BYOC customer, the company also launched partnerships with Octopus Energy U.S. and residential solar giant Sunrun, both of which will help Voltus expand beyond its original specialization in commercial and industrial demand response.

The goal from here is 20 GW under management by 2030, and that means scaling go-to-market operations, including sales and customer onboarding. It would more than double the company’s current capacity and would require relying heavily on battery deployment via the integration of Brightfield. The addition of that team, Guernsey explained to Latitude at the time of the acquisition, will mean combing through Voltus existing portfolio to identify sites already primed to host batteries as part of the BYOC program, before moving on to new customers.

That’s a strategy that could work particularly well in PJM, where Voltus has been extremely active in the stakeholder process shaping the region’s plans to secure capacity for data centers. Thanks to recent changes to the proposed framework, sites that had previously participated in demand response but didn’t participate last year can be “reactivated” and counted as new capacity. And, importantly for Voltus’ battery plans, PJM agreed to count incremental capacity, like new batteries, added at existing locations.